According to the organizers, here is a list of street closures and approximate times. Organizers say that final decisions about when to open and close streets will be made by police officers at various intersections. They say there also may be "rolling stops," which means an officer may allow vehicles to proceed when there is a gap between runners.

From this point on, at the intersection of Eastern Avenue and Linwood Avenue, the half-marathon course dovetails with the full marathon course and has the same closing and opening times.

Street closures for 2012 5K:

The entire course is closed from 8:00 a.m. to 9:15 a.m.

The 5K starts near the intersection of Paca Street and Camden Street. Runners go from that intersection up Paca Street to Martin Luther King Jr. Boulevard, along McCulloh Street from Martin Luther King Jr. Boulevard to Preston Street, along Preston Street from McCulloh Street to Howard Street and then back along Preston Street to Eutaw Street, along Eutaw Street from McCulloh Street to the finish line south of Pratt Street near Camden Yards. The route crosses Martin Luther King Jr. Boulevard, and portions of it will be closed to allow runners to cross.

Runners are on the course for the 2011 Baltimore Running Festival, which takes over downtown Saturday. With 25,000 runners, the crowd was expected to be the largest since the race began 11 years ago. Do you want to share your own pictures? Upload them here and see what others have submitted.

The Boston Marathon bombings on April 15, which killed three and injured hundreds, shook the running community. The Baltimore Running Festival, which takes place this weekend, is one of the first large-city marathons to occur since Boston, giving runners a chance to reflect on that day and...